Eye Conditions

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Cataract
Clouding of the natural lens of the eye, usually caused by aging in conjunction with other risk factors, such as exposure to the sun's UV rays, smoking, steroid intake and diabetes. Symptoms include blurred vision, glare, halos around lights, colors that are less bright, a cloudy spot in your vision and, sometimes, temporary vision improvement. Read more about cataracts and cataract surgery.

Cellophane Maculopathy
Cellophane maculopathy is the wrinkling or puckering of the retina as a result of contraction, which is caused by forward movement of the vitreous fluid and the resulting formation of a thin scar membrane on the surface of the retina.

Central Retinal Vein Occlusion
A blockage of the main vein transporting blood away from the retina; causes hemorrhage in the retina and usually results in permanent vision impairment.

Central Serous Chorioretinopathy
Condition that often affects males over age 30 who are under a lot of stress. Fluid builds up in the macula, resulting in blurred, distorted and shrunken images in that eye compared to the other. May last for several weeks or months.

Chalazion
Inflamed lump in a meibomian gland (in the eyelid). Inflammation usually subsides, but may need surgical removal. Sometimes called an internal hordeolum.

Chemical Burn
A chemical burn occurs when living tissue is exposed to an extremely reactive chemical substance such as a strong acid or base. Chemical burns need no source of heat, can occur immediately on contact, and are extremely painful. The exact symptoms of a chemical burn depend on the chemical involved.

Choroidal Neovascular Membrane (CNVM)
A CNVM is ultimately the result of a break in a structural layer beneath the retina known as Bruch's membrane, which separates the nourishing vascular layer called the choroid from the retina.

Choroidal Nevus
Rare tumors that can grow into a malignant melanoma. Like a raised freckle on the skin, nevi can occur inside the eye and should be seen by an eye doctor.

Cogan's Dystrophy
Cogan's Dystrophy is a disorder of the eyes, specifically a type of corneal dystrophy. It is also called epithelial basement membrane dystrophy, Cogan's microcystic epithelial dystrophy, map-dot-fingerprint dystrophy or dystrophic recurrent erosion. Cogan's Dystrophy affects the epithelial layer of the cornea in both eyes. The cells lose their attachments to the underlying Bowman's membrane and tend to tear away from the rest of the cornea causing pain, blurred vision and a red eye.

Color Blindness
Color blindness, or color vision deficiency, in humans is the inability to perceive differences between some or all colors that other people can distinguish. It is most often of genetic nature, but may also occur because of eye, nerve, or brain damage, or due to exposure to certain chemicals.